<template>
  <div class="app-container">
    <!--顶部header-->
    <mt-header fixed title="购物商城"></mt-header>
    <button type="button" 
	:class="['mui-btn mui-btn-link',this.$route.path === '/home'? 'hidden':'']" 
	@click="back(-1)">
      <span class="mui-icon mui-icon-back"></span>
      返回
    </button>

    <!--中间的路由router-view展示区域-->
    <transition>
      <keep-alive>
       <router-view v-if="$route.meta.keepalive"></router-view>
      </keep-alive>
    </transition>

    <transition>
    <router-view v-if="!$route.meta.keepalive"></router-view>
    </transition>
    
    <!--底部tabbar选项栏-->
    <nav class="mui-bar mui-bar-tab">
      <router-link class="mui-tab-item-llb" to="/home">
        <span class="mui-icon mui-icon-home"></span>
        <span class="mui-tab-label">首页</span>
      </router-link>
      <router-link class="mui-tab-item-llb" to="/member">
        <span class="mui-icon mui-icon-contact"></span>
        <span class="mui-tab-label">会员</span>
      </router-link>
      <router-link class="mui-tab-item-llb" to="/shopcar">
        <span class="mui-icon mui-icon-extra mui-icon-extra-cart">
          <span class="mui-badge" id="badge">{{$store.getters.getAllCount}}</span>
        </span>
        <span class="mui-tab-label">购物车</span>
      </router-link>
      <router-link class="mui-tab-item-llb" to="/search">
        <span class="mui-icon mui-icon-search"></span>
        <span class="mui-tab-label">搜索</span>
      </router-link>
    </nav>
  </div>
</template>

<script>
export default {
	data(){
		return {};
	},
	methods:{
		back(num){
			// 按钮返回方法
			this.$router.go(num);
		}
  },
}
</script>


<style lang="scss" scoped>
.mint-header {  //顶部heard
  z-index: 998; 
}
.mui-btn-link{	//返回按钮
	z-index: 999;
	position: fixed;
	top: 6px;
	color: #fff;
}
.hidden{
	display: none;
}
.app-container {
  padding-top: 40px;
  padding-bottom: 50px;
  overflow-x: hidden; //隐藏底部拖动横条
}

//要实现enter从右侧滑入，在leave-to往左侧滑出，所以需要分开写
.v-enter {
  opacity: 0;
  transform: translateX(100%);
}
.v-leave-to {
  opacity: 0;
  transform: translateX(-100%);
  position: absolute; //实现平滑过渡，不会出现高度跳跃
}
.v-enter-active,
.v-leave-active {
  transition: all 0.5s ease;
}

// 复制样式，改类名，解决因引入mui的js文件而引起 tabbar 点击无法切换的问题，因为mui-tab-item类名冲突
.mui-bar-tab .mui-tab-item-llb.mui-active {
  color: #007aff;
}

.mui-bar-tab .mui-tab-item-llb {
  display: table-cell;
  overflow: hidden;
  width: 1%;
  height: 50px;
  text-align: center;
  vertical-align: middle;
  white-space: nowrap;
  text-overflow: ellipsis;
  color: #929292;
}

.mui-bar-tab .mui-tab-item-llb .mui-icon {
  top: 3px;
  width: 24px;
  height: 24px;
  padding-top: 0;
  padding-bottom: 0;
}

.mui-bar-tab .mui-tab-item-llb .mui-icon ~ .mui-tab-label {
  font-size: 11px;
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
}
</style>
